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WO2021200369A1 - Tissu non tissé filé-lié - Google Patents

Tissu non tissé filé-lié Download PDF

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Publication number
WO2021200369A1
WO2021200369A1 PCT/JP2021/011884 JP2021011884W WO2021200369A1 WO 2021200369 A1 WO2021200369 A1 WO 2021200369A1 JP 2021011884 W JP2021011884 W JP 2021011884W WO 2021200369 A1 WO2021200369 A1 WO 2021200369A1
Authority
WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
woven fabric
spunbonded nonwoven
spunbonded
acid amide
Prior art date
Application number
PCT/JP2021/011884
Other languages
English (en)
Japanese (ja)
Inventor
中嶋格
阪上このみ
島田大樹
羽根亮一
Original Assignee
東レ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東レ株式会社 filed Critical 東レ株式会社
Priority to JP2021516826A priority Critical patent/JP7180761B2/ja
Priority to KR1020227032202A priority patent/KR20220150911A/ko
Priority to CN202180023575.3A priority patent/CN115315547B/zh
Publication of WO2021200369A1 publication Critical patent/WO2021200369A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/16—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic filaments produced in association with filament formation, e.g. immediately following extrusion
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers of the pads
    • A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00—Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/005—Synthetic yarns or filaments
    • D04H3/007—Addition polymers
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/021—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polyethylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/022—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polypropylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/061—Load-responsive characteristics elastic
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2509/00—Medical; Hygiene
    • D10B2509/02—Bandages, dressings or absorbent pads
    • D10B2509/026—Absorbent pads; Tampons; Laundry; Towels

Definitions

  • the present invention relates to a spunbonded non-woven fabric.
  • non-woven fabrics made of polyolefin are often used for non-woven fabrics for sanitary materials such as disposable diapers and sanitary napkins because of their lightness, low cost, and softness.
  • the backseat of paper diapers has many opportunities to touch, and the range of use is large, and it has a large effect on the appearance of diapers, so in addition to the feel and flexibility, the demand for design is increasing.
  • the appearance of disposable diapers those having a character or the like on the surface are desired as the appearance preferred by babies, and the function of printability on the surface of non-woven fabric is one of the important functions. Further, in terms of design, those having a silky appearance and high glossiness are particularly preferred.
  • Patent Document 1 it is difficult to obtain a good appearance due to large irregularities on the surface of the non-woven fabric and uneven printing.
  • a method of contacting with a thermal calendar or the like can be considered in order to smooth the surface, but in this method, the surface of the non-woven fabric is formed into a film, resulting in a hard texture.
  • an object of the present invention is to provide a spunbonded nonwoven fabric having good printability, excellent gloss, and flexibility in view of the above problems.
  • the spunbonded nonwoven fabric of the present invention is a spunbonded nonwoven fabric made of a polyolefin resin, and has an average fiber orientation of 0 to 30 degrees and a fiber ratio of 0 to 30 degrees of fiber orientation of 50 to 80%. Moreover, the tensile strength in the reference direction is 3 to 6 times the tensile strength in the direction orthogonal to it.
  • the average single fiber diameter of the fibers constituting the spunbonded nonwoven fabric is 6.5 to 11.9 ⁇ m.
  • the ratio of the surface roughness SMD by the KES method measured in the reference direction on at least one side and the direction perpendicular to the reference direction is 0.30 to 0.85.
  • the polyolefin-based resin contains a fatty acid amide compound having 23 to 50 carbon atoms.
  • the content of the fatty acid amide compound in the polyolefin resin is 0.01 to 5.0% by mass.
  • the fatty acid amide contains ethylene bisstearic acid amide.
  • the rigidity in the reference direction measured by the cantilever method is 10 to 80 mm.
  • the spunbonded nonwoven fabric of the present invention further satisfies the following formula (1).
  • G is the maximum value of glossiness
  • L is the average brightness
  • the spunbonded nonwoven fabric of the present invention is a spunbonded nonwoven fabric made of a polyolefin resin, and has an average fiber orientation of 0 to 30 degrees, fibers having a fiber orientation of 0 to 30 degrees of 50 to 80%, and a fiber orientation of 50 to 80%.
  • the tensile strength in the reference direction is 3 to 6 times the tensile strength in the direction orthogonal to it.
  • polyolefin-based resin examples of the polyolefin-based resin used in the present invention include polypropylene-based resin and polyethylene-based resin.
  • polypropylene-based resins examples include homopolymers of propylene or copolymers of propylene and various ⁇ -olefins.
  • polyethylene-based resin examples include a homopolymer of ethylene or a copolymer of ethylene and various ⁇ -olefins.
  • polypropylene-based resins are particularly preferably used because of their spinnability and strength characteristics.
  • the polyolefin-based resin used in the present invention may be a mixture of two or more kinds, or may be a resin composition containing another olefin-based resin, a thermoplastic elastomer, or the like.
  • the polyolefin-based resin used in the present invention may be a composite fiber in which a plurality of polyolefin-based resins are combined.
  • the composite form of the composite type fiber include a composite form such as a concentric core sheath type, an eccentric core sheath type, and a sea island type.
  • a concentric sheath type composite form because it has excellent spinnability and fibers can be uniformly bonded to each other by heat bonding.
  • the polyolefin resin used in the present invention includes antioxidants, weather stabilizers, light stabilizers, antistatic agents, antifoaming agents, antiblocking agents, lubricants, nucleating agents, as long as the effects of the present invention are not impaired. Additives such as pigments, other polymers and the like can be added as needed.
  • the melting point of the polyolefin resin used in the present invention is preferably 80 to 200 ° C, more preferably 100 to 180 ° C, and even more preferably 120 to 180 ° C.
  • the melting point is preferably 80 ° C. or higher, more preferably 100 ° C. or higher, and further preferably 120 ° C. or higher.
  • high heat resistance can be easily obtained.
  • the melting point is preferably 200 ° C. or lower, more preferably 180 ° C. or lower, it becomes easier to cool the yarn discharged from the mouthpiece, fusion of fibers is suppressed, and stable spinning becomes easier.
  • the melt flow rate of the spunbonded nonwoven fabric of the present invention (hereinafter, may be referred to as MFR) is preferably 155 to 850 g / 10 minutes.
  • MFR melt flow rate of the spunbonded nonwoven fabric of the present invention
  • melt flow rate (MFR) of the spunbonded non-woven fabric is measured by the method described later.
  • the MFR of the polyolefin resin which is the raw material of the spunbonded nonwoven fabric of the present invention is preferably 155 to 850 g / 10 minutes, more preferably 155 to 600 g / 10 for the same reason as in the case of the MFR of the spunbonded nonwoven fabric. Minutes, more preferably 155 to 400 g / 10 minutes.
  • the MFR of the polyolefin resin can be adjusted by blending two or more kinds of resins having different MFRs at an arbitrary ratio.
  • the MFR of the resin to be blended with the polyolefin resin is preferably 10 to 1000 g / 10 minutes, more preferably 20 to 800 g / 10 minutes, and further preferably 30 to 600 g / 10 minutes. By doing so, it is possible to prevent the blended polyolefin resin from having partial viscosity spots, resulting in non-uniform fineness and deterioration of spinnability.
  • this resin when spinning the fiber described later, this resin is decomposed with respect to the resin used in order to prevent the occurrence of partial viscosity unevenness, make the fineness of the fiber uniform, and further reduce the fiber diameter as described later. It is also conceivable to adjust the MFR. However, for example, it is preferable not to add a peroxide, particularly a free radical agent such as a dialkyl peroxide. When this method is used, viscosity spots are partially generated and the fineness becomes non-uniform, making it difficult to sufficiently reduce the fiber diameter, and when the spinnability deteriorates due to viscosity spots and air bubbles caused by decomposition gas. There is also.
  • the polyolefin resin contains a fatty acid amide compound having 23 to 50 carbon atoms.
  • the orientation of the fibers and the flexibility of the non-woven fabric can be easily improved.
  • the number of carbon atoms of the fatty acid amide compound By setting the number of carbon atoms of the fatty acid amide compound to 23 or more, preferably 30 or more, it is possible to prevent the fatty acid amide compound from being excessively exposed on the fiber surface, and to have excellent spinnability and processing stability, resulting in high production. Can retain sex.
  • the number of carbon atoms of the fatty acid amide compound By setting the number of carbon atoms of the fatty acid amide compound to 50 or less, preferably 42 or less, the fatty acid amide compound can easily move to the fiber surface, the fiber orientation tends to be uniform, and the flexibility of the spunbonded nonwoven fabric can be increased. Can be improved.
  • Examples of the fatty acid amide compound having 23 to 50 carbon atoms include a saturated fatty acid monoamide compound, a saturated fatty acid diamide compound, an unsaturated fatty acid monoamide compound, and an unsaturated fatty acid diamide compound.
  • fatty acid amide compounds having 23 to 50 carbon atoms tetradokosanoic acid amide, hexadokosanoic acid amide, octadokosanoic acid amide, nervonic acid amide, tetracosaentapenic acid amide, nicinate amide, ethylenebislauric acid amide, methylene.
  • Bislauric acid amide ethylene bisstearic acid amide, ethylene bishydroxystearic acid amide, ethylene bisbechenic acid amide, hexamethylene bisstearic acid amide, hexamethylene bisstearic acid amide, hexamethylene hydroxystearic acid amide, distearyl adipate amide , Distearyl sebacic acid amide, ethylene bisoleic acid amide, ethylene biserucate amide, hexamethylene bisoleic acid amide and the like, and these can be used in combination of two or more.
  • ethylene bisstearic acid amide which is a saturated fatty acid diamide compound
  • Ethylene bisstearic acid amide is preferably used for melt spinning because of its excellent thermal stability. Therefore, the fiber made of a polyolefin resin containing ethylene bisstearic acid amide makes it easy to obtain a spunbonded nonwoven fabric having higher slipperiness and flexibility while maintaining high productivity.
  • the content of the fatty acid amide compound in the polyolefin resin is preferably 0.01 to 5.0% by mass.
  • the content of the fatty acid amide compound is preferably 0.01 to 5.0% by mass, more preferably 0.1 to 3.0% by mass, and further preferably 0.1 to 1.5% by mass. , It is possible to impart appropriate slipperiness and higher flexibility while maintaining spinnability.
  • the content here means the mass percent of the fatty acid amide compound contained in the entire polyolefin resin constituting the spunbonded nonwoven fabric of the present invention. For example, even when the fatty acid amide compound is contained only in the sheath portion component constituting the core-sheath type composite fiber, the content ratio to the total amount of the core-sheath component is calculated.
  • an additive is solvent-extracted from the fibers of the polyolefin-based resin and quantitatively analyzed using liquid chromatograph mass spectrometry (LC / MS) or the like.
  • LC / MS liquid chromatograph mass spectrometry
  • the extraction solvent is appropriately selected according to the type of fatty acid amide compound.
  • a method using a mixed solution of chloroform and methanol can be mentioned as an example.
  • the average single fiber diameter of the fibers constituting the spunbonded nonwoven fabric is preferably 6.5 to 11.9 ⁇ m.
  • the average single fiber diameter is preferably 7.5 to 11.9 ⁇ m, and more preferably 8.4 to 11.9 ⁇ m.
  • the average single fiber diameter ( ⁇ m) of the fibers constituting the spunbonded nonwoven fabric is measured by the method described later.
  • the fibers constituting the spunbonded nonwoven fabric of the present invention preferably have a coefficient of variation (CV value) of a single fiber diameter of 7% or less.
  • -CV value of single fiber diameter (standard deviation of single fiber diameter) / (average single fiber diameter) x 100
  • the spunbonded nonwoven fabric of the present invention has an average fiber orientation of 0 to 30 degrees.
  • the average fiber orientation preferably 5 to 30 degrees, and more preferably 8 to 30 degrees, the fiber orientation becomes uniform, the uniformity and smoothness of the surface of the non-woven fabric are improved, and printing is performed. Good coatability.
  • the fiber ratio of the fiber orientation degree of 0 to 30 degrees is 50 to 80%.
  • the fiber ratio of 0 to 30 degrees of fiber orientation is preferably 60 to 80%.
  • the fiber orientation in the present invention refers to the angle between the reference direction of the non-woven fabric and the acute angle formed by one arbitrarily selected fiber.
  • the average fiber orientation in the present invention refers to the average fiber orientation measured for a predetermined number of fibers. The method for determining the reference direction, the fiber orientation, and the calculation method for the average fiber orientation are as described below.
  • the average fiber orientation and the fiber ratio of 0 to 30 degrees can be controlled, for example, by adjusting the fiber opening method, spinning speed, collection conditions, etc., or by adding a lubricant to the polyolefin resin. can.
  • the spunbonded nonwoven fabric of the present invention preferably has a surface roughness SMD ratio of 0.30 to 0.85 measured by the KES method measured in a reference direction on at least one side and a direction perpendicular to the reference direction.
  • the ratio of the surface roughness SMD measured by the KES method measured in the reference direction and the direction perpendicular to the reference direction is 0.30 or more, preferably 0.35 or more, and more preferably 0.40 or more, whereby the horizontal tensile strength is set. Can be prevented from dropping excessively.
  • high glossiness can be exhibited by setting the ratio of the surface roughness SMD by the KES method measured in the reference direction and the direction orthogonal to the reference direction to 0.85 or less.
  • the ratio of the surface roughness SMD by the KES method measured in the reference direction and the direction orthogonal to the reference direction can be controlled by, for example, appropriately adjusting the degree of fiber orientation.
  • the ratio of the surface roughness SMD by the KES method in the reference direction and the direction orthogonal to the reference direction is measured by the method described later.
  • the tensile strength of the spunbonded nonwoven fabric of the present invention in the reference direction is 3 to 6 times, more preferably 3 to 4 times the tensile strength in the direction orthogonal to it. If the ratio of the tensile strength is smaller than 3 times, there is a concern that the width may be increased during the molding process of the non-woven fabric. On the other hand, if the ratio of the tensile strength is larger than 6 times, the tensile strength in the direction orthogonal to the reference direction is not suitable for practical use.
  • the ratio of tensile strength can be controlled, for example, by adjusting the basis weight, average single fiber diameter and embossing roll (bonding ratio, temperature and linear pressure), or by adjusting the MFR of the polyolefin resin used.
  • the spunbonded non-woven fabric of the present invention preferably has a rigidity of 10 to 80 mm in the reference direction as measured by the cantilever method.
  • the rigidity is preferably 80 mm or less, more preferably 70 mm or less, further preferably 67 mm or less, and particularly preferably 64 mm or less.
  • sufficient flexibility can be obtained particularly when used as a non-woven fabric for sanitary materials. Can be done.
  • the lower limit of the rigidity and softness if the rigidity and softness are too low, the handleability of the non-woven fabric may be inferior. Therefore, it is preferably 10 mm or more, and more preferably 20 mm or more.
  • Rigidity and softness can be adjusted by basis weight, average single fiber diameter and embossed roll (compression rate, temperature and linear pressure).
  • the spunbonded nonwoven fabric of the present invention preferably further satisfies the following formula (1).
  • G is the maximum value of glossiness
  • L is the average brightness.
  • none of them has a unit.
  • the amount of lubricant added is increased, the average single fiber diameter is reduced, the average fiber orientation is reduced, and the fiber ratio with a fiber orientation of 0 to 30 degrees is set. There are methods such as raising the price.
  • the value obtained by dividing the product of G and L in the above formula (1) by 100 indicates that the spunbonded non-woven fabric is difficult to see through and is glossy. It is an index expressed quantitatively, and when the gloss strength of the appearance is 95 or more, more preferably 100 or more, a silk-like non-woven fabric having a high-class design and excellent white gloss is obtained.
  • the gloss strength of the appearance is not particularly limited in the present invention, but it is more preferably 200 or less from the viewpoint of losing a sense of quality as glare if the gloss is excessively strong.
  • G (maximum value of glossiness) and L (average brightness) used for calculating the gloss strength of the appearance are values measured and calculated by the following methods, respectively.
  • G (maximum glossiness) In the present invention, G (maximum value of glossiness) of the spunbonded non-woven fabric is the maximum value (without unit) measured by rotating the sample by 0 to 360 ° using a variable angle photometer. Point to that.
  • a three-dimensional angle change photometer GONIOPHOTOMETER GP-200
  • a 12V50W type halogen lamp or the like can be used as the light source
  • a photomultiplier tube or the like can be used as the receiver.
  • the L (average brightness) of the spunbonded non-woven fabric is a value measured by the following procedure.
  • a color multifunction device "DocuCenter-VI C4471 PFS" (Fuji Xerox Co., Ltd.) can be used.
  • a spunbonded non-woven fabric is pasted on a black mount (AC card black # 350).
  • Using a color multifunction device scan under the conditions of full color and 200 dpi to create a color scan image of the spunbonded non-woven fabric and save it in JPG format.
  • An image of 6 ⁇ 6 inches (1200 ⁇ 1200 pixels) is cut out from the color scan image.
  • the average value of the brightness (without unit) defined in the YUV color space for each pixel is defined as the average brightness.
  • R, G, and B represent the brightness (without unit) of red, green, and blue of the RGB color model, respectively.
  • the spunbonded non-woven fabric of the present invention preferably has a water pressure resistance per basis weight of 7 mmH 2 O / (g / m 2 ) to 20 mmH 2 O / (g / m 2 ).
  • the water pressure resistance can be adjusted by, for example, the fiber opening method, the basis weight, the average single fiber diameter and the embossing roll (crimping rate, temperature and linear pressure).
  • the basis weight of the spunbonded nonwoven fabric of the present invention is preferably 10 to 100 g / m 2.
  • the basis weight is preferably 100 g / m 2 or less, more preferably 50 g / m 2 or less, and further preferably 30 g / m 2 or less, thereby being suitable for sanitary materials. It becomes easy to obtain a spunbonded non-woven fabric having appropriate flexibility.
  • the spunbonded non-woven fabric of the present invention is a long-fiber non-woven fabric manufactured by the spunbonding method.
  • a spunbond method As a method for producing a non-woven fabric, a spunbond method, a flash spinning method, a wet method, a card method, an airlaid method and the like can be generally mentioned.
  • the spunbond method is excellent in productivity and mechanical strength, and can suppress fluffing and fiber shedding that tend to occur in short-fiber non-woven fabrics.
  • productivity and formation uniformity are improved by laminating multiple layers of collected spunbond non-woven fiber web or thermocompression-bonded spunbond non-woven fabric (both are referred to as S) with SS, SSS and SSSS. do.
  • a molten thermoplastic resin is first spun from a spinneret as long fibers, which is suction-stretched with compressed air by an ejector, and then the fibers are collected on a moving net to obtain a non-woven fiber web. .. Further, the obtained non-woven fiber web is heat-bonded to obtain a spunbonded non-woven fabric.
  • the shape of the spinneret and the ejector various shapes such as a round shape and a rectangular shape can be adopted.
  • the combination of a rectangular base and a rectangular ejector is possible because the amount of compressed air used is relatively small and the energy cost is excellent, the threads are less likely to be fused or scratched, and the threads can be easily opened. It is preferably used.
  • the polyolefin-based resin is melted in an extruder, weighed and supplied to a spinneret, and spun as long fibers.
  • the spinning temperature when the polyolefin resin is melted and spun is preferably 200 to 270 ° C, more preferably 210 to 260 ° C, and even more preferably 220 to 250 ° C.
  • the back pressure of the spinneret is preferably 0.1 to 6.0 MPa.
  • the back pressure of the spinneret can be adjusted by adjusting the discharge hole diameter, discharge hole depth, spinning temperature, etc. of the spinneret. In particular, the contribution of the discharge hole diameter is large.
  • the spun long fiber yarn is then cooled.
  • the method of cooling the spun yarn include a method of forcibly blowing cold air on the yarn, a method of naturally cooling at the atmospheric temperature around the yarn, and a method of adjusting the distance between the spinneret and the ejector. Etc., or a method of combining these methods can be adopted. Further, the cooling conditions can be appropriately adjusted and adopted in consideration of the discharge amount per single hole of the spinneret, the spinning temperature, the atmospheric temperature and the like.
  • the cooled and solidified yarn is towed and stretched by the compressed air injected from the ejector.
  • the spinning speed is preferably 3500 to 6500 m / min, more preferably 4000 to 6500 m / min, and even more preferably 4500 to 6500 m / min.
  • the spinnability deteriorates and it becomes difficult to stably produce a filament, but as described above, by using a polyolefin resin having a specific range of MFR, the intended polyolefin fiber can be obtained. It can be stable and easy to spin.
  • the obtained long fibers are collected on a moving net to obtain a non-woven fiber web.
  • the fibers are drawn at a high spinning speed, the fibers emitted from the ejector are collected in the net in a state controlled by a high-speed air flow, and it becomes easy to obtain a highly uniform non-woven fabric with less fiber entanglement. ..
  • the spinning speed / line speed ratio is 18 or more.
  • the direction of the fibers of the yarn ejected from the ejector that can collect the fibers on the moving net in the vertical orientation is set.
  • a method of uniformly aligning a method of inducing a thread by installing an angled flat plate between the ejector and the net, or by providing a plurality of grooves having different angles in the above flat plate, along the flat plate.
  • the method of arranging multiple flat plates having different angles at the ejector outlet in a comb-teeth shape and dropping the yarn along each flat plate to open the fibers efficiently unwoven the yarns having a fine fiber diameter. Since the fibers can be dispersed in the flow direction of the fiber web and can be opened in a controlled state without decelerating as much as possible, it is a preferable embodiment for aligning the orientation directions of the fibers.
  • the heat flat roll is brought into contact with the non-woven fiber web from one side on the net to temporarily bond it. By doing so, it is possible to prevent the surface layer of the non-woven fiber web from being turned over or blown off during transportation on the net, and the formation is deteriorated. The sex can be improved.
  • the intended non-woven fabric can be obtained by integrating the obtained non-woven fiber webs by heat bonding.
  • a heat embossed roll in which a pair of upper and lower roll surfaces are engraved (concavo-convex parts), a roll having a flat (smooth) one roll surface and an engraving on the other roll surface are used.
  • Thermal bonding methods using various rolls such as thermal embossing rolls consisting of rolls with (unevenness) and thermal calendar rolls consisting of a pair of upper and lower flat (smooth) rolls, and ultrasonic vibration of the horn. Examples thereof include a method such as ultrasonic bonding in which heat welding is performed.
  • a metal roll and a metal roll are used in order to obtain a sufficient thermocompression bonding effect and prevent the engraving (concavo-convex part) of one embossed roll from being transferred to the surface of the other roll.
  • a pair is a preferred embodiment.
  • the adhesive area ratio by heat embossing roll is preferably 5 to 30%.
  • the adhesive area ratio is preferably 5% or more, more preferably 8% or more, and further preferably 10% or more, sufficient strength as a spunbonded non-woven fabric can be easily obtained.
  • the adhesive area ratio is preferably 30% or less, more preferably 25% or less, and further preferably 20% or less, it is suitable for use as a spunbonded non-woven fabric for sanitary materials, especially for disposable diapers. It becomes easy to obtain appropriate flexibility. Even when ultrasonic bonding is used, the bonding area ratio is preferably in the same range.
  • the adhesive area ratio here means the area ratio of the adhesive portion to the entire spunbonded non-woven fabric. Specifically, when heat-bonding with a pair of uneven rolls, the spunbonded non-woven fabric of the portion (adhesive portion) where the convex portion of the upper roll and the convex portion of the lower roll overlap and come into contact with the non-woven fiber web. It refers to the ratio to the whole. Further, in the case of thermal bonding between a roll having irregularities and a flat roll, it means the area ratio of the convex portion of the roll having irregularities to the entire spunbonded non-woven fabric of the portion (adhesive portion) in contact with the non-woven fiber web. Further, in the case of ultrasonic bonding, it refers to the area ratio of the portion (adhesive portion) to be heat-welded by ultrasonic processing to the entire spunbonded non-woven fabric.
  • the shape of the bonded portion by thermal embossing roll or ultrasonic bonding a circular shape, an elliptical shape, a square shape, a rectangular shape, a parallelogram, a rhombus shape, a regular hexagonal shape, a regular octagonal shape, or the like can be used. Further, it is preferable that the adhesive portions are uniformly present at regular intervals in the longitudinal direction (conveyance direction) and the width direction of the spunbonded nonwoven fabric. By doing so, it is possible to reduce variations in the strength of the spunbonded non-woven fabric.
  • the surface temperature of the heat embossed roll at the time of heat bonding is ⁇ 50 to ⁇ 15 ° C. with respect to the melting point of the polyolefin resin used.
  • the surface temperature of the thermal roll is ⁇ 50 ° C. or higher, more preferably ⁇ 45 ° C. or higher with respect to the melting point of the polyolefin resin.
  • a spunbonded non-woven fabric having a strength that can be appropriately heat-bonded and put into practical use can be obtained. Can be done.
  • the surface temperature of the heat embossed roll to -15 ° C. or lower, more preferably -20 ° C. or lower with respect to the melting point of the polyolefin resin, excessive thermal adhesion is suppressed and spunbond for sanitary materials is used.
  • As a non-woven fabric it is possible to obtain appropriate flexibility particularly suitable for use in paper diaper applications.
  • the linear pressure of the heat embossing roll at the time of heat bonding is preferably 50 to 500 N / cm.
  • the linear pressure of the roll is preferably 50 N / cm or more, more preferably 100 N / cm or more, and further preferably 150 N / cm or more, so that a spunbonded non-woven fabric having sufficient strength can be appropriately heat-bonded. It will be easier to obtain.
  • the linear pressure of the heat embossed roll is preferably 500 N / cm or less, more preferably 400 N / cm or less, and further preferably 300 N / cm or less, so that it is particularly suitable as a spunbonded nonwoven fabric for sanitary materials. It is easy to obtain appropriate flexibility suitable for use in disposable diapers.
  • thermocompression bonding can be performed by a thermal calendar roll composed of a pair of upper and lower flat rolls before and / or after thermal bonding by the above thermal embossing roll.
  • a pair of upper and lower flat rolls is a metal roll or an elastic roll having no unevenness on the surface of the roll, and a metal roll and a metal roll may be paired, or a metal roll and an elastic roll may be paired.
  • the elastic roll here is a roll made of a material having elasticity as compared with a metal roll. Examples of the elastic roll include so-called paper rolls such as paper, cotton and aramid paper, and resin rolls made of urethane-based resin, epoxy-based resin, silicon-based resin, polyester-based resin and hard rubber, and a mixture thereof. Be done.
  • melt flow rate (MFR) of polyolefin resin The melt flow rate of the polyolefin resin was measured by ASTM D-1238 under the conditions of a load of 2160 g and a temperature of 230 ° C.
  • Average single fiber diameter ( ⁇ m) After towing and stretching with an ejector, 10 small sample samples were randomly collected from the non-woven web collected on the net, and a surface photograph of 500 to 1000 times was taken with a microscope, and 10 samples were taken from each sample. The widths of a total of 100 fibers were measured, and the average value was taken as the average single fiber diameter ( ⁇ m).
  • Metsuke Based on 6.2 "Mass per unit area” of JIS L1913: 2010 "General non-woven fabric test method", 3 test pieces of 20 cm x 25 cm were collected per 1 m of sample width, and each mass (g) in the standard state. ) was weighed, and the average value was expressed as the mass per 1 m 2 (g / m 2).
  • Average fiber orientation and fiber ratio of 0 to 30 degrees The values measured as follows were adopted. In the measurement, a scanning electron microscope "VHX-D500" manufactured by KEYENCE CORPORATION was used as the scanning electron microscope. (1) Ten test pieces having a width of 20 mm ⁇ 20 mm were collected from the spunbonded non-woven fabric at equal intervals in the width direction (horizontal direction) of the spunbonded non-woven fabric. (2) Using a scanning electron microscope, the vertical direction was set to 0 degrees for each sample, and the inclination of the fibers with respect to the vertical direction was measured for 20 fibers. (3) The average value of the inclination angles of a total of 200 fibers was taken as the average fiber orientation. (4) Of the total of 200 fibers, the number of fibers having a fiber orientation degree of 0 to 30 degrees was defined as the fiber ratio having a fiber orientation degree of 0 to 30 degrees.
  • the above measurement was performed at 3 points each in the reference direction (determined by the above method) and the direction perpendicular to the reference direction of all the test pieces.
  • the values obtained by averaging the average deviations and rounding off the second place after the decimal point are the surface roughness SMD ( ⁇ m) in the reference direction and the direction orthogonal to the reference direction.
  • the surface roughness SMD ( ⁇ m) of the above was used, and the value of the surface roughness SMD ( ⁇ m) in the reference direction / the surface roughness SMD ( ⁇ m) in the direction orthogonal to the reference direction was defined as the ratio of the surface roughness SMD.
  • Tensile strength The tensile strength was measured by the following method in accordance with JIS L1913: 2010 "General non-woven fabric test method", 6.3 “Tensile strength and elongation", 6.3.1 “Standard time”. Ten test pieces having a length of 200 mm and a width of 25 mm were collected in the vertical and horizontal directions of the non-woven fabric. A tensile test was carried out on the test piece with a constant-speed extension type tensile tester at a gripping interval of 100 mm and a tensile speed of 100 ⁇ 10 mm / min, and the strength (N) at maximum load until fracture was about 0.1 N. This was defined as tensile strength (N / 2.5 cm).
  • Water pressure resistance per basis weight The water pressure resistance per basis weight of the non-woven fabric was measured according to "7.1.1A method (low water pressure method)" of JIS-L1092: 2009 "Test method for waterproofness of textile products”. Five test pieces with a width of 150 mm x 150 mm were collected at equal intervals in the width direction of the non-woven fabric, and the test pieces were clamped using the FX-3000-IV water pressure resistance tester "Hydrotester" manufactured by Swiss Textest Co., Ltd.
  • Example 1 A polypropylene resin having an MFR of 200 g / 10 min to which 5.0% by mass of ethylene bisstearic amide was added as a fatty acid amide compound was melted by an extruder for a sheath component.
  • a polypropylene resin having an MFR of 200 g / 10 min without adding ethylene bisstearic acid amide was melted by an extruder for a sheath component.
  • a yarn spun from a .40 mm rectangular core sheath cap with a single-hole discharge rate of 0.30 g / min is cooled and solidified, and then pulled by a rectangular ejector with compressed air having an ejector pressure of 0.55 MPa. It was stretched. Subsequently, this was collected on a moving net to obtain a non-woven fiber web made of polypropylene filaments.
  • the characteristics of the obtained polypropylene filaments were that the fineness was 0.71 dtex, and the spinning speed converted from this was 4225 m / min. Regarding the spinnability, the yarn breakage was as good as 0 times in the spinning for 1 hour.
  • the obtained non-woven fiber web is used as an embossed roll with an adhesive area ratio of 11%, which is made of metal and has a polka dot pattern engraved on the upper roll, and a pair of upper and lower heats composed of a metal flat roll on the lower roll.
  • heat bonding was performed at a linear pressure of 300 N / cm and a heat bonding temperature of 145 ° C. to obtain a spunbonded non-woven fabric having a grain size of 25 g / m 2.
  • the obtained spunbonded non-woven fabric was evaluated. The results are shown in Table 1.
  • Example 2 A spunbonded nonwoven fabric was obtained by the same method as in Example 1 except that the basis weight was 15 g / m 2 and the line speed was 160 m / min. The obtained spunbonded non-woven fabric was evaluated. The results are shown in Table 1.
  • Example 3 A spunbonded nonwoven fabric was obtained by the same method as in Example 1 except that the amount of ethylene bisstearic acid amide added as a sheath component was 3.0% by mass. The characteristics of the obtained polypropylene filaments were that the fineness was 0.73 detx, and the spinning speed converted from this was 4109 m / min. Regarding the spinnability, the yarn breakage was as good as 0 times in the spinning for 1 hour. The obtained spunbonded non-woven fabric was evaluated. The results are shown in Table 1.
  • Example 4 A spunbonded non-woven fabric was obtained by the same method as in Example 1 except that ethylene bisstearic acid amide was not added to the sheath component. The characteristics of the obtained polypropylene filaments were that the fineness was 0.74 dtex, and the spinning speed converted from this was 4054 m / min. Regarding the spinnability, the yarn breakage was as good as 0 times in the spinning for 1 hour. The obtained spunbonded non-woven fabric was evaluated. The results are shown in Table 1.
  • Example 5 Except that the amount of ethylene bisstearic acid amide added as a sheath component was 0.5% by mass, the single-hole discharge amount was 0.40 g / min, the grain size was 15 g / m 2 , and the line speed was 200 m / min. , A spunbonded nonwoven fabric was obtained by the same method as in Example 1. The characteristics of the obtained polypropylene filaments were that the fineness was 0.85 dtex, and the spinning speed converted from this was 4705 m / min. Regarding the spinnability, the yarn breakage was as good as 0 times in the spinning for 1 hour. The obtained spunbonded non-woven fabric was evaluated. The results are shown in Table 1.
  • Example 1 A spunbonded nonwoven fabric was obtained by the same method as in Example 4 except that the single-hole discharge rate was 0.40 g / min, the basis weight was 10 g / m 2, and the line speed was 300 m / min. The characteristics of the obtained polypropylene filaments were that the fineness was 0.91 dtex, and the spinning speed converted from this was 3823 m / min. Regarding the spinnability, the yarn breakage was as good as 0 times in the spinning for 1 hour. The obtained spunbonded non-woven fabric was evaluated. The results are shown in Table 1.
  • Example 2 A spunbonded nonwoven fabric was obtained by the same method as in Example 5 except that a polypropylene resin having an MFR of 40 g / 10 min was used for both the core component and the sheath component and the ejector pressure was set to 0.30 MPa. The characteristics of the obtained polypropylene filaments were that the fineness was 1.30 dtex and the spinning speed converted from this was 3076 m / min. Regarding the spinnability, the yarn breakage was as good as 0 times in the spinning for 1 hour. The obtained spunbonded non-woven fabric was evaluated. The results are shown in Table 1.
  • Examples 1 to 5 were excellent in surface smoothness and had good printability. Further, since the average single fiber diameter of the fiber is 9.97 to 10.9 ⁇ m, and the ratio of the surface roughness by the KES method measured in the reference direction and the direction perpendicular to the reference direction is 0.53 to 0.66. , The non-woven fabric was excellent in flexibility and luster. On the other hand, as shown in Comparative Examples 1 and 2, when the numerical value of the average fiber orientation is relatively high, the average single fiber diameter exceeds 11.9 ⁇ m, and the surface roughness ratio is larger than 0.85, the surface of the non-woven fabric is used. The result was that the unevenness of the surface became large and the printability and glossiness were inferior.

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Abstract

Le but de la présente invention est de fournir un tissu non tissé filé-lié ayant d'excellentes propriétés d'impression, une brillance supérieure et une flexibilité.　Pour atteindre ce but, la présente invention présente la configuration ci-après. Plus spécifiquement, l'invention concerne un tissu non tissé filé-lié comprenant une résine de polyoléfine, dont l'orientation moyenne des fibres va de 0 à 30°, la proportion de fibres ayant une orientation de fibre de 0 à 30° étant de 50 à 80 % et la résistance à la traction dans une direction de référence étant de 3 à 6 fois la résistance à la traction dans une direction orthogonale.
PCT/JP2021/011884 2020-03-31 2021-03-23 Tissu non tissé filé-lié WO2021200369A1 (fr)

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JP7188732B2 (ja) 2018-07-09 2022-12-13 下西技研工業株式会社 ワンウェイクラッチおよびワンウェイクラッチ付き回転ダンパ装置

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